30 C.F.R. § 75.703-4 Other methods of protecting offtrack direct-current equipment; approved by an authorized representative of the Secretary.
Title 30 - Mineral Resources
Other methods of maintaining safe voltage by preventing a difference between the frames of offtract direct-current machines and the earth must be approved by an authorized representative of the Secretary.
Title 30: Mineral Resources
PART 75—MANDATORY SAFETY STANDARDS—UNDERGROUND COAL MINES
Subpart H—Grounding
§ 75.703-4 Other methods of protecting offtrack direct-current equipment; approved by an authorized representative of the Secretary.
